Explanation:

- Option 1: Sikkim

- Sikkim became the 22nd state of India on May 16, 1975, after merging with India in 1975.

- It was not the 25th state to achieve statehood.

- Option 2: Goa

- Goa became the 25th state of India on May 30, 1987.

- It was formerly a Union Territory along with Daman and Diu.

- Correct Answer: Goa was the 25th state to achieve statehood.

- Option 3: Arunachal Pradesh

- Arunachal Pradesh became the 24th state of India on February 20, 1987.

- It previously was a Union Territory.

- Option 4: Mizoram

- Mizoram became a state on February 20, 1987.

- It was the 23rd state of India.